Across
- 4. any trait that gives an advantage in survival
- 5. envelope of gasses surrounding earth
- 12. what scientists measure in a test
- 14. carefully planned,controlled fire
- 16. 1+ communities of different species interacting
- 17. set of physical conditions in lower atmosphere
- 18. using oxygen and glucose making energy
- 19. factual information collected by scientists
- 20. important factor in regulating growth
- 21. science that studies how living things interact
Down
- 1. managed forest with only 1 or 2 species
- 2. gradual change in species composition
- 3. what is being tested
- 6. states the how or why
- 7. variety of life on Earth
- 8. both species benefit
- 9. disease causing agent
- 10. states the facts
- 11. pattern of atmospheric conditions over years
- 13. cold,low humidity storage to preserve genes
- 15. removal of large expanses of forest